These are small plastic ( Poly ) variable capacitors with dual 3-60pf and 6-141pf sections. You can connect the 60pf and the 141pf section together for 9-201pf if you want.

Screws and washers for the variable capacitor are available in two lengths: 5/32" (4mm) and 3/16" (5mm). The shaft and two mounting holes are both tapped metric M2.5.

CAUTION: The internal parts of the variable capacitor can be damaged easily if the screw enters the variable capacitor too far. Please check for clearance.

Shafts that fits all my poly variable capacitors are available in 12mm or 14mm length.

12mm x 6.35mm Shaft

14mm x 6.35mm Shaft

I have two sizes of knobs that fit the above shafts.

20.3mm Knob

34.8mm Knob